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Derivative Instruments and Hedging Activities (Forward Contracts by Balance Sheet Location) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
[1]
Designated as Hedging Instrument | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 1.1 $ 0.3
Designated as Hedging Instrument | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.9  
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.1 0.6
Designated as Hedging Instrument | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 7.8  
Designated as Hedging Instrument | Forward exchange contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 1.1 0.3
Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0  
Designated as Hedging Instrument | Forward exchange contracts | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 1.4 $ 0.6
Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0  
Designated as Hedging Instrument | Interest rate swap agreements | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0  
Designated as Hedging Instrument | Interest rate swap agreements | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.9  
Designated as Hedging Instrument | Interest rate swap agreements | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0  
Designated as Hedging Instrument | Interest rate swap agreements | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 7.8  
Not Designated as Hedging Instrument | Forward exchange contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0  
Not Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0  
Not Designated as Hedging Instrument | Forward exchange contracts | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.7  
Not Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 0.0  
[1] Includes an immaterial amount of forward foreign exchange contracts not designated as hedging instruments as of March 31, 2018.